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The talks are sponsored by Russia, Turkey and Iran whose representatives in the Kazakh capital of Astana have held meetings with delegates from both sides late into the evening Sunday and early on Monday.

The opposition delegation, which arrived in Astana on Sunday, is made up of about a dozen rebel figures led by Mohammad Alloush of the powerful Army of Islam rebel group.

The Syrian government has sent its U.N. ambassador, Bashar Ja'afari, and military delegates.